Mining machine



my 9 1 A. c. WlLcox ,@WQM

` MINING MACHINE Filed sept 17, 1951 8 Sheng-sheet 1 ulggmglmlcenmls'Wuy 9, H935., A. c. WlLcox UW@ MINING MACHINE Filed Sept. 17,1931 8Sl'leess--Sl'leecl 2 .|I l l Il 1 muy 1935; A, WILCQX www@ MININGMACHINE Filed Sept. 17, 1931 8 Sheets-Sheet 5 Wullly 9,- i935.-

.' C. WILCOX MINING MACHINE Filed Sept. 17, 1931 8 SheetsfSheet 4 Juy 9,1935..

A. C. WlLCOX MINING MACHINE 8 Sheets-Sheet 6 Filed Sept. 17, 1931 July1935. A, C, WILCOX 00mm MINING MACHINE Filed Sept. 17, 1951 8Sheets-Sheet 7 @eww/0%@ M5612@ 6T @Mmm @@Awa# W@ wy.

A. C. WILCOX MINING MACHINE Filed Sept. 17, 1951 July 9, 1935.,

8 Sheets-Sheet 8 frame or body l, through improved adjustable supportingmeans 5, is a rotatable cutter head 5 having pivotally mounted thereon akerf cutting element The frame or body l consists of a base portion 'lhaving a rearward upstanding portion or standard 8 from which thereprojects a horizontal arm-like portion e, the latter extending forwardlyfrom the standard 3 and overlying the base portion l in the mannershown. Pivotally mounted at lil on the forward extremity of the arm-likeportion s is a block member il. This block member is provided with acylindrical projection l2 forming a journal, and is retained in positionwithin a bore i3 formed in the arm, by means of a retaining nut i4threadedly connected to the projection l2. As shown, pivotally connected to the block member i i at l5, l5 are spaced parallel arms l, EE,in turn pivotally connected at il, il to and supporting a plate I8. Alsopivotally connected to this plate member about axes coincident with theaxes of the arms I6, I are spaced parallel arms i9, i e, in turnpivotally conu nected at 2B, 23 to a frame member 2l. The two pairs ofarms i6, l@ and i9, i9 in conjunction with the block l l plate i8 andframe member 2l, consttute a double parallelogram structure by which theframe member 2l with its attached parts is mounted on the arm-likeportion d of the machine body. As shown in Fig. l1, the frame member 2iis provided with a cylindrical bearing portion 22, herein in the form ofa neck, on which the cutter head Si is rotatably mounted. From theforegoing it will be evident that the parallel frame structure maintainsthe axis of the cutter head always parallel to a common straight lineduring swinging of the arm structure transversely across the machine;and to permit the axis of the cutter head to be disposed angularly withrespect to said common straight line, there is provided means forrotating the block member to change the spacial relation of the arms asshown in Fig. 13.. The rotating means for this block member comprises aworm wheel 23 keyed at 2G to the block member and with which meshes aworm 25. The worm 25 is fixed to a horizontal shaft 2@ arrangedtransversely of and suitably journaled within bearing brackets 2l,attached to the arm-like portion S of the machine frame. Suitably fixedto the shaft 2S is a hand wheel 28. As the hand wheel 28 is rotated, theblock member E l is rotated through the worm gearing, and this rotativemovement of the block member is transmitted through the parallel armsi6, i5 to the plate I8 and the parallel arms i9, i9 to the frame member2l, causing the latter to be tilted laterally in one direction or theother to change the angular position of the cutter head axis. The wormgearing 2e, 25 is of the self-locking type and maintains automaticallythe parts in their adjusted position.

Now referring to the improved motor operated devices for actuating thecutting element, it will be noted that arranged within the rearwardportion of the machine frame is a motor 3b, herein preferably of thereversible electric type having its power shaft 3l horizontally disposedand extending longitudinally of the machine. Fixed to the forward end ofthe motor power shaft is a worm 32 meshing with a worm wheel 33, in turnfixed to a horizontal shaft Sli. The shaft 34 is arranged transverselyof the machine frame and is suitably journaled therein and has fixedthereto at one end thereof a chain sprocket 35 which drives, through anendless chain connection 35, a sprocket 3l fixed to a horizontal shaft38,

herein arranged parallel with and above the shaft 3d. As shown in Fig.'7, splined to the shaft 38 are bevel gears 39, 48, and these gears areadapted to mesh with a bevel gear di to effect rotation of the latterselectively in either of opposite directions. The mechanism for shiftingthe bevel gears 39, lll alternatively into meshing engagement with thebevel gear lll, comprises shipper yokes ft2, 43 suitably fixed to ahorizontal actuating shaft M slidably mounted within the machine frameand provided with a pivoted operating lever 15. As shown in Fig. 5, thebevel gear "il is suitably fixed to the rear end of a longitudinallyextending shaft 4t, and xed to the forward end of this shaft is a bevelgear 4l constantly meshing with a bevel gear 48, in turn suitably fixedto a vertical shaft 59. The shaft 49 is arranged with its axiscoincident with the axis of rotation of the lock member l i and issuitably journaled within this block member in the manner shown.Suitabiy fixed to and driven by the shaft 49 is a bevel gear 5tconstantly meshing with a bevel gear 5l suitably xed to a horizontalshaft 52, the latter being arranged with its axis parallel with andmidway between the arms I6, IG, as shown in Fig. ll. The shaft 52 isjournaled at its opposite ends with bearing brackets or blocks 53, 54,the bearing bracket 53 being rotatably mounted on the shaft 9, while thebearing bracket tiliis rotatably mounted on a vertical shaft 55 carriedby the plate member i Suitably secured to and driven by the shaft 52 isa bevel gear constantly shaft 55. Also fixed to and driven by the shafti5 is a bevel gear 53 constantly meshing with a '-uf bevel gear 59suitably fixed to a horizontal shaft d, herein arranged parallel withand midway between the arms i9, lil. The shaft El) journaled within abearing bracket or block 6i rotatably mounted on the shaft 55 and abearing bracket or block F32 rotatably mounted on a vertical shaft 63journaled within the frame member 2 l. Suitably xed to and driven by theshaft 6G is a bevel gear "54 constantly meshing with a bevel gear 55suitably fixed to the shaft @3, and this bevel gear constantly mesheswith and drives a bevel gear 65 suitably nxed to a horizontal shaft 5lextending through the neck along the axis of the cutter head. Suitablyfixed to and driven by the shaft 61 is a bevel gear E8 constantlymeshing with a bevel gear 69 suitably fixed to a shaft lf3 arranged withits axis coincident with the pivot axis and constituting the drivingshaft for the cutting element. Secured to and driven by the shaft 'i5 isa chain sprocket 'l i, which er "es and drives in a well known manner anendless cutter bit carrying cutter chain 'I2 mounted for circulationabout the margin of an elongated plane cutter bar 'f3 of a usual design.It will thus be seen that due to the arrangement of the transmissionshafts 52, E@ and the several driving gears, the cutter chain 'f3 may bedriven irrespective of the position of the arm structure relative to themachine frame, it being possible to swing the cutting mechanism from oneside of the machine to the other while the cutter chain is continuouslydriven.

The means for pivotally mounting the cutter bar on the cutter head andthe means for swinging the cutter bar and rotating the cutter head, willnow be described. The cutter bar 'I3 is provided with a cylindricalprojection 'ill having a radial flange l5 mounted within` a circular guiden way formed by an annular plate 'r6 suitably rig idly secured to thecutter head frame. Fixed to Ajournaled within the machine frame.

'th-eicylindricalfprojectionfld is a worm wheel 'I1 with whichineshes aworm 'liisuitably'ixed to a transverse shaft lt. Secured to the shaft T9is a handiwheel 3&3.. Itwill therefore be evident that when the handwheel 313 is turned the cylindrical projection lli is rotated throughthe worm gearing ll, it, thereby swinging the cutter bar 'i3 about itsaxis relative to the cutter head. -The worm gearingl il', i8 is oftheLself-locking type and maintains automatically the cutter bar in itsdifferent positions of adjustment. The cutter head "rotating meanscomprises a worm gear segment 3l `secured to the 'cutter head frame andwith the teeth of which meshes a worm t2 secured to a `hr'srizontalshaftA 83.' The shaft B3 is arranged transversely of the cutter headframe and is `suitably journaled within bearing brackets 84 securedtothe framemember Zi. Fixed to one end of treshaftti` is a hand wheel85. As this hand wheelis rotated, the cutter head 5 is turned aboutits'axis through the Worm gearing 8i, 82 to position the cutter. bar inthe horizontal cutposition, as indicated in full lines in Fig. l2, or inits opposite shearing positions, at opposite sides of the vhead axis, asindicated in dotted lines in that ngure.. Due to the fact that the neckportion of` the frame member E l `is concentric with `the shaft 'iitfollows that the driving connection through the shafts and gearsaforementioned to the chain sprocket 'H will be maintained irrespectiveofrotation of the cutter head about the neck axis. Likewise, due to thecutter bar being fswingable about the'axis of theshaft l0, it followsthattheidriving connection to the chain sprocket will also be maintainedirrespective of any angu- `larpnsition to which` the .cutter bar may. bemoved fwith respect to the cutter head.l

Now referring to the mechanism for moving the machine as an entiretyalong the mine trackway,

it wilibeobserved that splined to the shaft 3d at vone side of wormwheel'id is a pair of reverse bevels 86, 3i, While splined to this shaftat'the opposite side of `the worm wheel is a pair of reverse bevels 88,8S. The bevel's'i, 8l are movable into alternative meshing engagementwith a bevel gear 9d fixed to a vertical shaft QI suitably The bevelsS8, SQ are movable into alternative meshing engagement with a bevel gear92 fixed to a vertical shaft @3er-ranged paralleliwith the shaft Si and`likewise suitably jonrnaled in the machine frame.

Fixed Ato the shafts ti and ehirespectively, are rope winding drums 9dand 95 having wound thereupon feed cables` 95 and 91. The free ends ofthese cables are providedwith `hooks dii-normally engageable withinopenings formed in the upper drum flanges, as shown in Fig. 7, wherebysaid drums with the cables wound thereon may be rotated. withouttendency of the cables to unwind from the' drums. `The sides of themachine frameare providedl withopenings ed, 99 through which the freeends ofthe feed cables may be extended in` the manner to` be laterdescribed. `Jcurnaled adjacent the openings S9 are guide rolls me, IBDaround which the feed cables are adapted topass. of the shaft 9i, isabevel gear itil with which is adapted to'mesh a'bevel-gear |932 splined`to a transverse shaft itil. Keyed to the shaft I @5 is a -chain sprocketHl which drives, through an endless chain connection Mld', asprocket |66fixed to the-rear truckwheel axle im.' vThe mechanism for shifting thereverse bevels tt, 81 and S8, 89 into meshing engagement with theirrespective bevel `gearsldt and 92, comprises shipper yokes 108, |09

standing rod As shown in Fig. 7, fixed to the lower end engaging annulargrooves .in the hubs of the gears and-rigidly fixed to attransverseactuating rod I i@ suitably guided within the machine frame. The-rodNilis provided with a screw threaded `portion l I I with whichthreadedly engages a rotatable nut H2 rotatably mounted at H3 on theframe of the machine. Secured to the nut i E2 is a hand wheel l Mi. twillthus be seen that as one 'or the other of the hand wheels is rotatedthe `rod.` HG is moved axially in one direction or the Aother to effectthe meshing engagement of one or ing engagement and one or the other ofthe bevel gears 86, 8T! is in meshing engagement with the bevel gear 9B,the truck wheels may be driven in one direction or the other to propelthe machine bodily along the mine Vtrackway. It will also be noted thatthe feed cables on the winding drums S, 95 under certain conditions maybe extended in a suitable manner forwardly and rearwardly along theopposite sides of the machine and connected at their free ends to'suitable anchors, and

as the drums are rotated in the proper direction the feed cables `maybe.wound in to; move the apparatus bodilyalong the mine trackway in the'desired direction Wholly independently of the v truck wheel drive. n ii .Y

Thevarious parts Vsupported by the parallel motion structure, includingthe rotatable cutter head and pivoted cutter bar, are relatively heavy,'and as the arms suspended from the armlike portion il of the machineframe are incapable in themselves of` supporting said parts against`sagging `movement, there is secured at E28 to the framemember 2i thelower end of an uprigidly to the top of the arm-like portion 9 of themachine frame, as shown in Fig. l. The arm ft2? and rod iti cooperate toform `an auxiliary or supplemental support for the supporting structureLl, andas this supporting structure is swung laterally the arm i2?.swings about its fpivotlfl on the truck while the latter traversesthetracks l2?, to permit the supporting 'structure to be shifted while itis supported by the arm 122. The hand wheel E23 provides means forvertically adjusting the frame memlberi to eliminate possible binding ofthe parts connecting this framernember to the arm-like portion 9 of themachine frame.

4In the present construction, pivotally connected at i351 at one end tothe forward end `ofV the machine frame, at one side thereof, is `anelongated guide arm l3l carrying on its free .endagnide roll i152, whilesimilarly pivoted at `the other side of the machine frame is an identi-:cal arm' 33 carrying at its free end a guide roll ist a positionlparallel to the machine frame against the side thereof, asshown in fulllines in Figs. 1

Each of these arms is swingable between lili, which rod extends -looselyl' Vthrough the free end of a horizontal arm V22 Vandliras?threadedthereon a hand wheel 623. The `arm it? is pivotally connected at R24 toa truck i E25, which is provided with Wheels |26. These truck wheelsrun-in a suitable manner bevtween upper and lower tracks if? suitablysecured and 4, to a position at, 0r substantially at, right angles tothe machine frame, as shown in dotted lines in Fig. l and in full linesin Figs. 11, 13 and lll. Each of these arms, furthermore, has pivotedthereto a brace |35, which may be extended at an angle to its relatedarm and suitably engaged at its free end with the machine frame to holdits arm in extended position with respect to the machine frame. Each ofthe arms I9, I9 of the parallel motion structure is provided adjacentthe frame member 2| with an eye |39 to which the hooks 98 on the feedcables are respectively connectible, for a purpose hereinafterdescribed.

The general mode of operation of the improved coal mining machine willnow be described. The mining machine may be propelled along the minetrackway either forwardly or rearwardly by means of the motor 3|! gearedto the truck wheels, or by the cable winding drums 94, 95, as conditionsmay determine under the control of the reverse bevels 86, 81 and 88, 89,and the sliding gear |92. When the machine is suitably positionedadjacent the coal face and it is desired to undercut the wall of thecoal, the operation is as follows: The hook 98 is detached from the drumflange and the feed cable 91 is extended from the drum 95, laterallythrough the opening 99, around the guide roll |99, around the guide roll|32 carried by the guide arm |3|, the latter being disposed in its rightangle position with respect to the machine body at that time; and thefree end of this cable is connected by the hook 98 to the eye |36 formedon the adjacent arm I9 of the parallel motion support structure. Thefeed cable 91 is then slowly wound in, and as a result the supportstructure, together with the parts carried thereby, is swung laterallyto a position adjacent the right hand rib, as indicated at A in Fig. Ll.Next the lever is manipulated to move the gear 39 into meshingengagement with the gear 4|, which, through the gearing previouslydescribed, effects actuation of the cutter chain 12 about the margin ofthe cutter bar 13. Then by manipulating the lever ||8 the truck wheelsare connected in driving relation with the motor 39, and as a result,the machine is fed as an entirety along the mine trackway to cause thecutter bar to penetrate the wall of the coal. When the cutter bar haspenetrated the coal to the desired depth, movement of the machine alongthe trackway is discontinued, and the other guide arm |33 is swungoutwardly to its right angle position with respect to the machine body,and the hook 98 is detached from the drum flange and the cable 91 ispassed laterally through opening 99, around guide roll |09, and aroundguide roll |34 on the free end of the guide arm |33, and the hook 93 onthe free end of the cable is engaged in the eye |39 on the adjacent armI9 of the parallel motion support structure. The drum 94 is thensuitably connected in driving relation with the motor to c-ause thecable 96 to be wound slowly onto the drum 94, thereby causing the armstructure, together with the parts connected therewith, to move thecutter head, and consequently the cutter bar laterally with respect tothe machine, resulting in the cutting of a kerf of substantially uniformdepth across the coal face by a single continuous operation, the cutterbar being moved from the position A indicated in Fig. 4 to the positionB shown in that figure. During this operation and other operationsduring horizontal cutting, the cutter bar may be swung about its pivotrelative to the arm structure simply by turning the hand wheel 80 of thecutter swinging mechanism.

Under certain conditions, the cutter bar 13 when in the central positionindicated at C in Fig. 4 may be sumped in an endwise direction into thecoal, and when the coal is penetrated to the desired depth, the feedcable 91 may be connected to the parallel motion arm structure and thecutter bar moved from left to right from the position C at the center ofthe entry to the position indicated at A in Fig. 4 adjacent the righthand rib of the entry. Thereafter, the other feed cable 9S is connectedto the adjacent arm |9 of the support structure, and the cutter bar ismoved from right to left, from the posi tion indicated at A in Fig. 4 tothe position in dicated at B, thereby to complete the horizontal cut.After the completion of the horizontal cut the cables are rewound ontheir respective drums, the hooks 99 attached to the drum flanges, andthe guide arms are folded against the sides of the machine body.

When it is desired to make a shearing or vertical cut in the coal face,the operator turns the hand wheel 85 to move the cutter bar through anarc of a circle from the full line position shown in Fig. l2 to one orthe other of the dotted line positions indicated in that figure. Theoperator then turns the hand wheel 89, thereby swinging the cutter barto the position indicated at D in Fig. 1. The machine is, then fedbodily along the mine trackway until the cutterbar assumes a positionclosely adjacent the face of the coal, and thereafter the cutter bar isswung downwardly in its plane by suitable manipulation of the hand wheel89 to effect its shearing cut. Under certain conditions, the cutter barwhen disposed in its vertical or shearing position may be swung upwardlyto the position indicated at E in Fig. 1, and thereafter the machine maybe fed bodily along the mine trackway to cause the cutter bar topenetrate the wall of coal. After completion of the sumping cut, thecutter bar may be swung downwardly in its plane and thereafter themachine may be fed bodily rearwardly to withdraw the cutter bar from thecoal. As the machine herein described operates to cut kerfs in bothvertical and horizontal planes in accordance with the standard arc wallpractice, further description of the mode of operation of the machine isunnecessary. These and various other methods of use of the improvedmining machine will be clearly apparent to those skilled in the art.

As a result of this invention it will be noted that an improved coalmining machine is provided of the combined horizontal and shear cuttertype, whereby both horizontal and vertical kerfs may be cut in the coalface and whereby a horizontal cut of substantially uniform depth may bemade completely across the face of the coal. It will further be notedthat by the provision of the improved adjustable parallel motion supportstructure for the cutter head it is possible to insert vertical or shearcuts at either rib of the entry or at any point intermediate the ribs.Further, by the provision of the improved adjustable supportingstructure for the cutting mechanism, it is possible to move the cutterbar through a comparatively wide range, thereby enabling the machine toaccommodate itself to entries of various widths.

While I have in this application specifically described one form whichmy invention may assume in practice, it Will be understood that thisform isis-hewn for purposes of illustration only, and that the inventionmay be embodied in various other forms Without departing from its spiritor the scope of the appended claims.

What I Letters Patent is:

1. In `a mining machine', a `portable base, an adjustable supporting armstructure mounted on said base to' swing horizontally relative theretoand comprising spaced parallel horizontally dis: posed arms pivotallyconnected to the Vbase to swing about parallel vertical and a kerlcutting mechanism mounted on tlficouter extremity of and whollysupported by saidar'rn structure and including a kerf cutter adjustablebodily relative to the arm structure into different cutting positions,said arms arranged in parallel relation and pivotally connected to thecutting mechanism about parallel vertical axes, the axes at the op`posite ends oi said arms being spaced at equal distances apart and saidarms always maintaining the kerf cutter, in any of aforesaid cuttingpositions, parallel to a line extending longitudinally of the machineduring swinging of the arms horizontally from one side of said base tothe other.

2l. In a mining machine, a portable base,- a supporting arm structurepivotally mounted on said base to swing horizontally relative theretoand comprising spaced parallel horizontally disposed arms pivotalllyconnected to the base to swing about parallel vertical aX'es, and kerfVcutting mechanism mounted on the outer extremity ci and whollysupported by said arm structure and including a rotatable cutter headand a keri cutter pivotally mounted on said cutter head, said kerlcutter adjustable with said head into' diierent cutting positions aboutthe head axis, said arms arranged'in parallelrelation and piv-v otallyconnected to thercutting mechanism about parallel vertical axes, theaxes at the opposite ends oi` said arms being `spaced at equal`distances apart and said arms always maintaining the cutter head axisparallel to aline extending longitudinally of the apparatus in any oiaforesaid cutting positions of the kerl cutter and during swinging ofsaid arm structure horizontally from one` side` of said base to theother. Y

3. In a mining machine, av portable base, an arm structure pivotallymounted on said base to swing 4horizontally relative thereto, a cutterhead rotatably mounted on tli'e outer extremity of said arm structure,anda keri cutter pivotally mounted on said cutter head and adjustablewith said cutter head relative tosaid arm structure into horizontal and,vertical cutting positions, said arm structure always maintaining saidkerl cutter parallel to a longitudinally extending plane during swingingotsaid arm structure.

ingl machinaa portable base, aparallel link st` uctui-epivotally mountedon saidbase to swing horizontally about parallel vertical axes relativethereto, and kerl?A cutting mechanism mounted on the outer extremity ofsaid link structure and adju 'able relative thereto into horizontal ve.alcutting positions.

Y 5. In a mini-ng machine,y a portable base,- a parallel linksupportingfstructure pivotally rnunted on saidbaseA to' swinghorizontally relz-itiveA thereto and comprising spaced parallelhorizontally disposed `links pivotally .connected to' the base to swingaboutv parallel vertical axes, a frame c'arried at the' outer extremityof and Wholly sup'- ported by' said link structure; `and" kerl cuttingclaim as new and desire to secure by:

mechanism mounted on said frame and including a cutter head rotatablymounted on said frame and a kerf cutter pivotally mounted on said cutterhead and adjustable with said head aboutthehead axis into diierentcutting'positions, said links arranged in parallel relation andpivotally connectedto said frame about parallel vertical axes, the axesat the opposite ends of said links being spaced at equal distancesapart.

6. In a mining machine, a` portable base, a parallel link structurepivotally mounted on` said base to swing horizontally about parallelVvertical ases relative thereto, a frame carried at the outer extremityof said link structure, a cutter head rotatably mounted onsaid frame,and a kerf cutter pivotally mounted on said cutter head and adjustablewith said cutter head relative to said links into horizontal andverticalcutting' positions.

7. In a miningmachine, a portable base, an arm structurepivotally'mounte'd on said base to swingrelative thereto, keri cuttingmechanism mounted ori the outer' extremity o said arm structure andadjustable` relative thereto into horizontal and vertical cuttingpositions,- and means supplemental to said arm structure for supportingsaid cutting mechanism during swinging ofsaid structure relative to saidbase.

S. In a mining machine, a` portable base, a parallel link structurepivotally mounted on said and comprising pairs of parallel links, andkeri cutting mechanism mounted on the outer extremity of said linkstructure and adjustable relative thereto in'to horizontal andverticalcutting positions.

tljln a mining machine,V a portable base, a

parallel link structure pivctally mounted on said and comprising pairsci parallel links, a`

cutter head rotatably mounted on the outer extremity of said linkstructure, and a kerl cutter pirotally mounted on said cutter head andadjustable with said cutter head relative to said link structure intohorizontal and vertical cutting positions. Y

10. In a mining machine, a portable base, kerf cutting ,mechanism onsaid base including an elongated kerf cutter, and adjustable. supportingmeans for said kerf cutter swingable horizontally Arelative to said basefor movingr said kerf cutter during such horizontal swinging movementlaterally in a substantially straight path while said cutter remainsallthe time parallelgto longitudinally extending vertical plane to cut ahorizontal {3i-substantially uniform depth in the coal race,l saidsupporting means including meansufor positioning said kerf cutter in ahorizontal cutting position and for positioning said korf cutter in a:`position to' cut an angularly disposed kerf.

il. In a mining machine', a portable base, kerl cutting mechanism onsaid base including an elongated kerl cutter, andadjustable supportingmeiosis forV said kerl cutter swingable horizontally relative to saidbase for moving said korf cutter during such horizontal swingingmovement laterally in a substantially straight path while said cutterremains all the time parallel to a longitudinally extending verticalplane to cut a horizonta'l-kerf of substantially uniform depth in thecoal iac'e, said supportingv means including means for positioning saidkerf cutter in a ,horizontal cutting position Vand for positioning saidkerf cutter inra position to cut a vertical korf.

j l2. In a mining machine, al portable base, kerl cutting mechanismthereon including an elongated keri cutter, adjustable supporting meansfor said k'erf cutter for positioning saidkerf;` cutter to cut in ahorizontal plane or in a vertical plane,`

and mechanism mounted on said base to swing horizontally relativethereto for moving said kerf cutter during such horizontal swingingmovement in its horizontal plane laterally in a substantially straightpath while said kerf cutter remains at all times parallel to alongitudinally extending vertical plane to cut a kerf of a uniform depthacross the coal face.

13. In a mining machine, a portable base, kerf cutting mechanism thereonincluding an elongated pivoted kerf cutter mounted for swinging movementrelative to said base, adjustable supporting means for said kerf cutterfor positioning said kerf cutter to operate in angularly disposedplanes, mechanism mounted on said base to swing horizontally relativethereto for moving said kerf cutter during such horizontal swingingmovement in one of its planes laterally in a substantially straight pathwhile said kerf cutter at all times remains stationary as regardspivotal movement to cut a kerf of a substantially uniform depth acrossthe coal face, and means for swinging said kerf cutter about its pivotin its angularly disposed plane.

14. In a mining machine, a portable base, a kerf cutting mechanismthereon including an elongated pivoted kerf cutter swingable relative tosaid base, adjustable supporting means for said kerf cutter includingmeans for positioning said kerf cutter to cut a kerf in a horizontalplane or in a vertical plane, mechanism mounted on said base to swinghorizontally relative thereto for moving said kerf cutter during suchhorizontal swinging movement in its horizontal plane laterally in asubstantially straight path while said keri cutter at all times remainsstationary as regards pivotal movement to cut a kerf of a substantiallyuniform depth across the coal face, and mechanism for swinging said kerfcutter about its pivot to cut a vertical kerf.

15. In a mining machine, a portable base, kerf cutting mechanism thereonincluding an elongated kerf cutter, adjustable supporting means for saidkeri cutter on which said kerf cutter is pivotally mounted for swingingmovement relative thereto, means mounted on said base to swinghorizontally relative thereto for moving said ker cutter during suchhorizontal swinging movement laterally in a substantially straight pathwhile said kerf cuttei` at all times extends parallel toa longitudinallyextending vertical plane to cut a ker of a substantially uniform depthacross the coal face, and means for independently swinging said cutterbar about its pivot to make an arcuate cut.

16. In a mining machine, a portable base, kerf cutting mechanism thereonincluding an elongated kerf cutter, a motor on said base, adjustablesupporting means for said kerf cutter mounted o-n said base forhorizontal swinging movement relative thereto including means foradjusting said kerf cutter into a position to cut a horizontal kerf andfor moving said kerf cutter during horizontal swinging movement of saidsupporting means laterally in a substantially straight path while themajor axis of said kerf cutter always remains perpendicular to the coalface to cut a horizontal kerf of a substantially uniform depth acrossthe coal face and for positioning said kerf cutter to cut a verticalkerf, and driving connections between said motor and said kerf cutter.

1'7. In a mining machine, a portable base, kerf cutting mechanismadjustably mounted thereon including an elongated kerf cutter, mechanismon said base for adjusting said kerf cutter into horizontal and verticalpositions, and mechanism mounted on said base for horizontal swingingmovement relative thereto for moving said kerl cutter during suchhorizontal swinging movement in one of its positions laterally in asubstantially straight path while said kerf cutter always remainsparallel to a longitudinally extending vertical plane to cut asubstantially straight face kerf of a substantially uniform depth acrossthe coal face.

18. In a mining apparatus, a portable base, an adjustable supportingstructure comprising parallel links pivotally connected to said base toswing horizontally relative thereto about parallel vertical axes, aframe supported by said links, said links pivotally connected to saidframe about parallel vertical axes and the axes at the opposite ends ofsaid links being spaced at equal distances apart, a cutter head mountedon said frame for rotation relative thereto about a horizontal axis, akerf cutter pivotally mounted on said cutter head and adjustable withsaid head about the head axis into different cutting positions, anddevices for rotating said cutter head about its axis relative tosaidframe.

19. In a mining apparatus, a portable base, parallel links pivotallyconnected to said base to swing horizontally relative thereto aboutparallel vertical axes, a frame supported by said links, a cutter headmounted on said frame for rotation relative thereto about a horizontalaxis, a kerf cutter pivotally mounted on said cutter head, and devicesfor swinging said kerf cutter about its pivot relative to said cutterhead.

20. In a mining apparatus, a portable base, parallel links pivotallyconnected to said base to swing horizontally relative thereto aboutparallel vertical axes, a frame supported by said links, a cutter headmounted on said frame for rotation relative thereto abouta horizontalaxis, a kerf cutter pivotally mounted on said cutter head, devices forrotating said cutter head about its axis relative to said frame, anddevices for swinging said kerf cutter about its pivot relative to saidcutter head.

21. In a mining apparatus, a portable base, a kerf cutter adjustableinto horizontal and vertical cutting positions, an adjustable supportingstructure plurally articulated to said base on parallel pivots andsupporting said ker cutter when the latter is in its vertical cuttingposition for adjustment into parallel vertical planes, said kerf cutterbeing adjustable relative to said Isupporting structure into aforesaidcutting positions, and means for adjusting said supporting structureabout its plural articular connections with said base to effectaforesaid adjustment of said kerf cutter into parallel vertical planes.

22. In a mining apparatus, a portable basv a frame, a rotatable cutterhead mounted on said frame for rotation relative thereto, a kerf cutterpivotally mounted on said cutter head, an adjustable supportingstructure plurally articulated to said base on parallel pivots andsupporting said frame for adjusting said cutter head laterally relativeto said base, and means for adjusting said supporting structure aboutits plural articular connections with said base to eirect aforesaidadjustment o1 said cutter head into different lateral positions.

23. In a mining apparatus, a portable base, an arm structure pivotallymounted on said base to swing horizontally relative thereto, a framesupjin ported on the outerextrernity of saidarm structure and to whichsaid arm structure is pivotally connected,`saidl frame being swingableVrelative to said arm structure, said arm structure and trarneconstituting a parallel motion device-having provision for maintainingparallelism selectively to different angularly related horizontal lines,acutter head mounted on said frame'for rotation relative thereto about ahorizontalaxis extending longitudinally of the apparatus when `said armstructure is in midiposition between the sides of said base, a kerfcutter `pivo-tally mounted on said cutter head, and devices for rotatingsaid cutter head about its axis and for swinging said lrerf cutteraboutits pivot.

24. In Aa mining apparatus, a portable base, an arm structure pivotallymounted on said base to swing horizontally relative thereto, a framesupportedon the outer extremity of said arm structure and to which saidarm structure is pivotally connected, said frame being swingablerelative to said arm structure about an axis parallel with the pivotalaxis of the arm structure, said armistructure and frame constituting aparallel motion device having provision for maintaining parallelismselectively to diirerentangularly related horizontal lines, a cutterhead mounted Aon said frame for rotation relative thereto about ahorizontal axis, a kerf cutter pivotally mounted on said cutter head,devices for rotating said cutter head aboutits axis and `for swingingsaid lrerf cutter about its pivot, andniotor operated devices forswinging said arm structure horizontally relative to said base.

25. In a mining apparatus,v a portablebase, an i rotating said cutterhead about its axis and for swinging lreri cutter about its pivot, andniotor operated devices for swinging said arm structure horizontallyrrelative to said base and inr'ling motor supported on said base andrelae to which said arrnlstructure is swingable.

, in aniining` apparatus, a portable base, supporting links pivotallyconnected to base to swing horizontally relative thereto parallelvertical axes, a frame supported by saidlinks, said links pivotallyconnected to said frame about parallel vertical axes and the aries atthe` opposite ends of said links Vbeing spaced at equal distances apart,a cutterhead mounted on said trarne for rotation relative thereto abouta horizontal axis, and a kerf cutter pivoi-aily mounted on saidcutterhead and adjustable th said headabout the head axis into diierentcutting positions, said parallel .links maintaining said cutter headaxis alwaysiparallel to a common straight line during swinging of saidlinks horizontally about their pivots.

2'?. in a mining apparatus, a portable base, a parallel motion armstructure overhanging said and pivot-ally mounted at itsrearwardextremity on said base to swing ,in ahorizontal `direetion relativetheretoabout parallel vertical overhang-ing extremity 'or said l arni`structure. and

adjustable rela'ive to said arm structure into horizontal and verticalcutting positions.

28. In a mining apparatus, a portable base, a parallel motion armstructure overhanging said base pivotally mounted at its rearwardextremity on said Vbase to swing in a horizontal direction relativethereto about parallel vertical axes, a cutter head mounted on the outeroverhanging extremity of said arm struct-ure for rotation relativethereto about a horizontal axis, and a kerl? cutter pivotally mounted oncutter head and .rotatable therewith about the head axis relative tosaid arm structure into horizontal and vertical cutting positions.

29.`In a mining apparatus, a portable base, parallel supporting linkspivotally connected to said base for swinging movement in a horizontaldirection relative thereto about parallel vertical axes, a framesupported by said links, said links pivotally connected to said frameabout parallel vertical axes and the axes at the opposite ends of saidlinlrsbeing spaced at equal distances apart, a cutter head mounted onsaid frame for rotation relative theretoabout a horizontal axis, and akorf cutter pivotaliy mounted on said cutter head and adjustable withsaid head' about the head axis into different cutting positions.

30. ln a. mining apparatus, a portable base, a parallel motion armstructure including an'arin element pivotaliy mounted on theiorward endof said base to swing in a horizontal directionrelative thereto about avertical 'a keri cutter mounted on the outer extremity or said armstruczontal and vertical cutting positionsa motor car ried by said baseand relative toiwhieh said structure is swine'able, and devices drivenby said motor for actuating said kerf cutter..

31. lin a mining apparatus, a portable base, an ai'nistructure includingan arm element pivotally mounted on the forward end of said base toswing `in a horizontal direction relative thereto about a vertical axis,a keri cutter mounted on the o-uter extremity of said arrn structure andad justable relative thereto into horizontal and ver tical cuttingpositions, a motor carried by said base relative to which said armstructure is swingable and whose position does not change with anychange in position of said kerf cutter relative to said base, devicesdriven by said motor for actuating said kerf cutter, andjdevices drivenby said motor for swinging said arm structure relan tive to said base.

32. In a mining apparatus, a portable base, an arm structure includingan arm element pvotally mounted on the forward end of said base to swingin a horizontal direction relative thereto about a vertical axis, acutter head mounted on the outer extremity of said arm structure forrotation relative thereto about a horizontal axis, and a kerf Vcutterpivotally mounted on said cutter head and rotatable therewith relativeto said arm structure into horizontal and vertical cutting positions,said armstrueture constitu-ting mechanism for automatically maintainingthe axis of said cutter head parallel to a common straight line duringswinging of said arm structure.

33; In a mining apparatus, a portable hase, a supporting struc-turemounted on said base in" cluding parallel arrns pivotally mounted on theforward end of said base for swinging movement lture and adjustablerelative thereto into horirelative thereto about vertical axes, and akerf 34. In a mining apparatus, a portable base, a supporting structuremounted on said base including spaced parallel arms pivotally mounted onthe forward end of said base for swinging movement relative theretoabout vertical axes, a l-:erf cutter mounted on the outer extremities ofsaid arms for adjustment relative thereto into horizontal and vei'toalcutting positions, and devices for adjusting said armsr to vary theirparallel relationship to effect adjustment of the kerf cutter angularlyrelative to the vertical.

35. In a mining apparatus, a portable base, an adjustable supportingstructure including parallel arms pivotally mounted on the forward endof said base for swinging movement relative thereto about vertical axes,and a kerf cutter mounted on the outer extremity of said supportingstructure for adjustmen-t relative thereto vinto horizontal and verticalcutting positions, said arms maintaining automatically said kerf cutterparallel t0 a common straight line during swinging of said arms abouttheir pivots relative to said base.

36. In a mining apparatus, a portable base, an

. adjustable supporting structure including parallel arms pivotallymounted on the forward end of said base for swinging movement relativethereto about vertical axes, a cutter head mounted on the outerextremity of said supporting structure for rotation relative theretoabout a horizontal axis, and a kerf cutter pivotally mounted on saidcutter head and rotatable therewith relative to said supportingstructure into horizontal and vertical cutting positions.

37. In a mining apparatus, a portable base, an adjustable supportingstructure including parallel arms pivotally mounted on the forward endof said base for swinging movement relative thereto about vertical axes,a cutter head mounted on the outer extremity of said supportingstructure for rotation relative thereto about a horizontal axis, a kerfcutter pivotally mounted on said cutter head and rotatable therewithrelative to said supporting structure into horizontal and verticalcutting positions, and devices for adjusting said arms to vary theirparallel relationship to effect movement of said kerf cutter angularlyrelative to the vertical.

38. In a mining apparatus, a portable base, an adjustable supportingstructure including parallel arms pivotally mounted on the forward endof said base for swinging movement relative thereto about vertical axes,a cutter head mounted on the outer extremities ci said arms for rotationrelative thereto about a horizontal axis, and a kerf cutter pivotallymounted on said cutter head and rotatable therewith relative to saidsupporting structure into horizontal and vertical cutting positions andsaid arms maintaining automatically said cutter head axis parallel to acommon straight line during swinging of said arms about their pivotsrelative to said base.

ng appara-tus, a portable base, a rotatable cutter head, a kerf cutterpivotally mounted on said head, and an adjustable supporting structurebetween said base and cutter head by which the latter is supported andrelative to which said head is rotatable for swinging said cutter headlaterally in either direction relative to said base while the head axisalways remains parallel to a horizontal line extending longitudinally ofthe apparatus, said supporting structure comprising spaced parallelhorizontally disposed arms pivotally connected at their opposite ends tothe base and head about parallel vertical axes,` the axes at theopposite 'ends of said arms being spaced at equal distances apart.

40. In a mining apparatus, a portable base, a kerf cutter, an adjustablesupporting structure between said base and kerf cutter including an armpivotally connected to said base, devices for swinging said arm aboutits pivot to move said kerf cutter laterally relative to said base,linkage devices for maintaining said kerf cutter at all times parallelto a common straight line during such lateral adjustment, and devicescarried at the outer end of said arm for adjusting said kerf cutter intohorizontal and Vertical cutting positions,

41. In a mining apparatus, a portable base, a kerf cutter, an adjustablesupporting structure between said base and said kerf cutter for swingingsaid kerf cutter abou-t a vertical axis on said base into differentlateral positions while said kerf cutter at all times automaticallyremains parallel to a common straight line, and devices on the outerextremity of said supporting structure for adjusting said kerf cutterinto horizontal and vertical cutting positions.

42. In a mining apparatus, a portable base, a horizontal kerf cutter,and an adjustable double parallelogram supporting structure mounted onsaid base and carrying said kerf cutter, said kerf cutter alwaysextending parallel to a longitudinally extending plane during adjustmentof said Supporting structure.

43. In a mining machine, a portable base, an adjustable arm structuremounted on said base to swing horizontally relative thereto, kerfcutting mechanism including a kerf cutter mounted on the outer extremityof said arm structure for adjustment bodily relative thereto intohorizontal and vertical cutting positions, said cutting mechanism andarm structure being adjustable relative to said base to enable the kerfcutter to cut parallel vertical kerfs parallel to the longitudinalmedian line of the base between the sides of said base and beyond thesides of said base, all while said kerf cutter remains in verticalcutting position, a motor on said base and relative to which said armstructure is swingable for adjusting said arm structure and kerf cutterand for actuating said kerf cutter and means for adjusting said kerfcutter relative to said arm structure.

44. In a mining machine, a portable base, an adjustable arm structuremounted on said base to swing horizontally relative thereto, kerfcutting mechanism including a cutter head rotatably mounted on the outerextremity of said arm structure and a kerf cutter mounted on said cutterhead and adjustable with said head into different cutting positionscompletely about the head axis, said cutting mechanism and arm structurebeing adjustable relative to said base to position the kerf cutter tocut parallel vertical kerfs parallel to the longitudinal median line ofthe base between the sides of said base and beyond the sides of saidbase, all while said kerf. cutter remains in vertical cutting position,a motor on said base and relative to which said arm structure isswingable for adjusting said arm structure and for actuating said kerfcutter, and means for rotating said cutter head.

45. In a mining machine, a portable base, an adjustable arm structuremounted on said base to swing horizontally relative thereto, kerfcutting mechanism including a cutter head rotatably mounted on the outerextremity of said arm structure and a kerf cutter mounted on said cutterhead for adjustment bodily relative thereto into ,diierent cuttingpositions, said cutting Amechanism and arm structure being adjustablerelative.

to `said base `to position the kerf cutterto cut parallel vertical kerfsparallel to the longitudinalmedian line of the base between the sides ofsaid base and -beyond the sides of said base, all whilesaid kerf cutterremains in vertical cutting positionMa` motor on said base and relativeto structurepagcutter head rotatably mounted on.y

20; said frame, and a kerf cutterpivotally mounted which said armstructure is swingablefor swinging said arm structure and kerf cutter`andfor actuatingJ saidkerf cutter, and means foriadjust` ing said kerfcutter relative to said arm structure. Y

46.` In `a mining machine, a portable base, a parallelmotion supportingrstructure mounted on saidbase zfor adjustment horizontally relativethereto about parallel vertical axes, a frame-car-` ried at-theouterextremity of saidsupporting on said cutter head and adjustablewithsaid head of the body at either side ofthe latter.

aboutthe head axis. l y l 4 47. Avcoal cutting machine comprisingabody,`

a outterbar mounted on said body forpivotal movement about two separateaxes oneV of which extends at all times vertically and the` other ofwhich is Yadjustable between verticallyY and hori zontally extendingpositions, and means including a swinging frame mounted on said body forshiftingsaid irstmentioned axis transversely ofthe machine f topositions outside the lateral 'limits :48; A coal cutting machinecomprising a body, a motor mountedon said body and having its axis ofvdriving shaft `rotation permanently xed against motion V,with respectto said body, a cutterbar mounted on said body for pivotal move-A mentabout two separate axes each of whichextends-at all times transverselywith respect to the longitudinal axis of the machine and one of which isadjustable `between vertically and horizontally extending positions,means including a swinging framev mounted on said kbody for shiftingsaid.

axes transversely of the machine, .said cutter bar including amovablecutting element, and a constant driving connection between said motorand saidcutting element. j f

49. A coal cutting machine comprising a body, a memberv mounted on saidbody forswinging adjustment bodily transversely of. the fmachine and forpivotal adjustment about a vertical axis,

in any position of adjustment thereof transversely of the machine, saidErnemb'erhaving a range of swinging `adjustment to L position saidvertical axis outside the lateral .limits or the "machine body at eithersideof the latter, a second member b mounted on said first memberforpivotall adjustmentwith respect theretoabout an axis disposed at rightangles to the axis of pivotal movement of said rst mentioned member, andaicutter' bar mounted on said second mentioned member for pivotaladjustment about an axis disposed `at right angles to the axis 'of thepivotal connection betweensaid members. .l 50; -A coal cutting machinecomprising abody,

a member mounted on said bodyfor swinging'ad-v justment bodilytransversely of the machine and for pivotal adjustment about a verticalaxis in any position of adjustment thereof` transversely-.of

the machine, said `member having a range of swinging adjustment toposition said vertical axis outside the lateral limitsof the machinebody at either side ofthe latter, a second member mounted on said firstmember for'pivotal'adjustment withrespect thereto about an axis disposedat right angles to lthe ax-is ofv pivotal movement of said firstmentioned meinbeiya cutter bar mounted on said `second mentioned memberfor pivotal adjustment about an axis disposed at right angles to theaxis of the pivotal connection between said members, and means on thebody for pivotally adjusting said first mentioned member.

51. A coal cutting machine comprisinga body, a member mounted on saidbody for swinging adjustment bodily transversely of the machineV and forpivotal adjustment abouta vertical axis in any position of adjustmentthereof transversely of the machine, said member having a rangeofswingingadjustmenttopositionfsaid vertical axis outside the laterallimits of Vthe machine body at eitherside of the latter, a Vsecondmember mount-` ed on said rst member for pivotal adjustment' 52. `.Acoal cutting machine comprising a body,`

a member mounted on said body for swinging adjustment bodilytransversely of the machine land forpivotal adjustment about a` verticalaxis in any position of adjustment thereof'transversely of `the machine,saidmember having a range of swinging adjustment to position saidvertical axis,

outside the lateral limits of the machine body at `either side of` thelatter, a second member mounted on said first member for pivotaladjustment withrespeot thereto about an axis disposed at right angles tothe axis `of pivotal movement of said rst mentioned member, a cutter barmounted on said second mentioned member; for pivotal adjustment about anaxis disposed at right angles to the `.axis of the pivotal connectionbetweensaid members, and means on said second mentioned member for'pivotally adjusting said cutter bar with respect thereto.

. 53. A coal cutting machine comprising a body, a member `mounted onsaid body, a pair of arms pivotally connected at adjacent ends to saidmemberiat spaced points, respectively, a second member to which theopposite ends of said armsv are pivotally connected at spaced points,respectively, .asecond pair of arms pivotally con- 'nectedat adjacentends to said second member on pivots coaxial with the pivotalconnections of said rstpair of arms therewith, a third member to whichthe opposite ends of said second pair of arms are pivotally connected atspaced points, respectively, and a cutter bar carried by said thirdlmember.

54. A coalcutting machine comprising a body, a member mounted onV saidbodyl for rotaryadjustment'aboutv a vertical axis, a pair of armspivotally connected at adjacent ends to said member at spaced points,lres ectively, a second member to which the opposite ends of saidparmsarepivotally connected. at spaced points, rrespectively, a second pairof arms pivotally con- `nected at adjacent ends to said second member onpivots coaxial with the ypivotal connections of 'said rst pair of armstherewith, a third memberf to which the opposite ends of said secondpair of arms are pivotally connected at spaced points, respectively, acutter bar carried bylsaid third member, and means for rotatably adjusting said iirst' mentioned member.

55. A coal cutting machine comprising a body, a member mounted on saidbody, a pair of arms pivotally connected at adjacent ends to said memberat spaced points, respectively, a second member to which the oppositeends of said arms are pivotally connected at spaced points,respectively, whereby said second member is mounted for bodily shiftingmovement with respect to the body of the machine, a cutter bar connectedwith said second mentioned member, said first mentioned member beingmounted on said body for rotary adjustment, and means for rotatablyadjusting said rst mentioned member thereby to rotatably adjust saidsecond mentioned member and said cutter bar in any bodily adjustedposition of said second mentioned member and said cutter bar..

56. In a mining machine, a portable base, an adjustable supporting armstructure mounted on said base to swing horizontally relative thereto,and a kerf cutter mounted on the outer extremity of and supported bysaid arm structure for adjustment bodily relative thereto into parallelplanes, said arm structure always automatically maintaining said kerfcutter parallel to a line extending longitudinally of the machine duringswinging of said arm structure.

57. In a mining machine, a portable base, a supporting arm structurepivotally mounted on said base to swing horizontally relative thereto, acutter head rotatably mounted on the outer extremity of and supported bysaid arm structure, and a kerf cutter pivotally mounted on said cutterhead and adjustable with the head about the head axis into parallelplanes, said arm structure always automatically maintaining the cutterhead axis parallel to a line extending longitudinally of the machineduring swinging of said arm structure.

58. In a mining apparatus, a portable base, a rotatable cutter head, akerf cutter pivotally mounted on said head and adjustable with said headabout the head axis into parallel planes, and an adjustable supportingstructure between said base and cutter head by which the latter issupported and relative to which said head is rotatable for swinging saidcutter head laterally in either direction relative to said base whilethe head axis automatically always remains parallel to a horizontal lineextending longitudinally of the apparatus.

59. In a mining machine, a portable base, an adjustable supporting armstructure mounted on said base to swing horizontally relative thereto,and a kerf cutter mounted on the outer extremity of and supported bysaid arm structure and adjustable bodily relative to the arm structureinto different cutting positions while the kerf cutter remains at alltimes parallel to a line extending longitudinally of the base, said armstructure always maintaining said kerf cutter parallel to a lineextending longitudinally of the machine during swinging of said armstructure horizontally from one side of said base to the other.

60. In a mining machine, a portable base, a supporting arm structurepivotally mounted on said base to swing horizontally relative thereto, acutter head rotatably mounted on the outer extremity of and supported bysaid arm structure, and a kerf cutter pivotally mounted on said cutterhead and adjustable with said head about the head axis into diierentcutting positions while the kerf cutter remains at all times parallel toa line extending longitudinally of said base, said arm structure alwaysmaintaining theV cutter head axis parallel to a line extendinglongitudinally of the base during swinging of said arm structurehorizontally from one side of said base to the other.

61. In a mining machine, a portable base, a parallel link supportingstructure pivotally mounted on said base to swing horizontally relativethereto, a frame carried at the outer extremity of and supported by saidlink structure, a cutter head rotatably mounted on said frame, and akerf cutter pivotally mounted on said cutter head and adjustable withsaid cutter head about the head axis into different cutting positionswhile the kerf cutter remains at all times parallel to a line extendinglongitudinally of said base.

62. In a mining apparatus, a portable base, an adjustable supportingstructure comprising parallel links pivotally connected to said base toswing horizontally relative thereto, a frame supported by said links, acutter head mounted on said frame for rotation relative thereto about ahorizontal axis, a kerf cutter pivotally mounted on said cutter head andadjustable with said head about the head axis into different cuttingpositions while said kerl? cutter at all times remains parallel to aline extending longitudinally of said base, and devices for rotatingsaid cutter head about its axis relative to said frame.

63. In a mining apparatus, a portable base, parallel supporting linkspivotally connected to said base to swing horizontally relative thereto,a frame supported by said links, a cutter head mounted on said frame forrotation relative thereto about a horizontal axis, and a kerf cutterpivotally mounted on said cutter head and adjustable with said headabout the head axis into different cutting positions while the kerfcutter at all times remains parallel to a line extending longitudinallyof said base, said parallel links maintaining said cutter head axisalways parallel to a common straight line during swinging of said linkshorizontally about their pivots.

64. In a mining apparatus, a portable base, parallel supporting linkspivotally connected to said base for swinging movement in a horizontaldirection relative thereto, a frame supported by said links, a cutterhead mounted on said frame for rotation relative thereto about ahorizontal axis, and a kerf cutter pivotally mounted on said cutter headand adjustable with the head about the head axis while the kerf cutteralways remains parallel to a line extending longitudinally of theapparatus.

65. In a mining apparatus, a portable base, a rotatable cutter head, akerf cutter pivotally mounted on said cutter head and adjustable withsaid head about the head axis into different cutting positions while thekerf cutter at all times remains parallel to a line extendinglongitudinally of said base, and an adjustable parallel motionsupporting structure between said base and cutter head by which thelatter is supported and relative to which said head is rotatable forswinging said cutter head laterally in either direction relative to thebase while the head axis always remains parallel to a horizontal lineextending longitudinally of the apparatus.

66. In a mining apparatus, a portable base, a parallel motion deviceincluding an arm pivotally mounted on said base and a second armpivotally supported on said rst arm about an axis parallel with thepivotal axis of the rst arm, said second arm overhanging said base, and.

vit

a :'kerf .1 cutter pivotally mountedvfo'n the .forward overhanging:extremity 1 of` said second arm, said armsbeingwadjustableaboutktheirpivotal axes to movesaidlkerf cutter horizontally'to cut-ahorii j zontalskerfand saidv secondiarm being: swingablel relativetosaidfirst armfto swing saidkeri cutterhorizontally.relative 'tof saidbasanand means Y forla'djusting said `.arms i relativeito said. base.

, arrnsbeingiadjustable about tlieir'pivotal-axes toizmovesisaid kerfcutter `horizontally tocut a horizontal vkerl, andmeansferiadjustingsaid :arms` relative to said `loasegsai'd second armlbeingiswingable,horizontally relative to j the iirst arm while the latterlremains stationary as v regards swinging movement about its ownaxis;`

` 168.1na mining apparatus, a portable base, aparallel motiondeviceincludingA an arm pivot- 'ally'mounted on saidbase and a secondarm piv- Jotally. mounted on saidrst arm, said second arm :overhangingsaid base, lal cutter head rotatably` mounted on the uter overhangingextremity of saidf second arm, and a kerf cutter pivotally mountedfonsaid cutterhead `and adjustableiwith said heada'bout theihead axis intodiierent cutting positions, said armsbeing adjustable to move `said kerflcutter into different cutting positions, `and lmeansffor adjustingsaid'armsfrelativeto Isaid-base. i

69. In va mining apparatus, a portable-base,

laparallel motion `device includingV an arm pivotally-mounted on saidlbaseand a `second arm .pivotallyfmounted on said1.rstarm,`said second`arm overhanging said bas`e,. a cutter head rotat- :ablymounte'd on' theouter overhanging extremity `osaid second arm,tand .a lerf cutter pivot-.ially :mounted onsaid cutter'iheadfand. adjustable -with `said, headabout the head axis` into. different cuttingpositions, said arms beingadjustable to "move `saidl-kerf cutter into `different cuttingpositions, and means for adjustingisaid arms. relative ,to-said base,said second arm being `swingable frelative 1 tol tlieiirst `arm4 while"the latter" remains :stationary as regards swingingtmovement about itsown-axis. l i f `'70. In a mining apparatus, aportablebase, anlarmpivotallymounted at itsforwardiend at the `forward endoi said base,a `second arm supported by said lfirst arm and pivotally :mounted.atitsv rear end on lthe rear end oi saidlfnst arlinfsaid second armextending. forwardly .in advance .dof

saidbase,fanda kerf cutter pivotallyvrnounted on the outer extremity cisaid'secondarm. T71. Inga `mining apparatusga portable base,

a1-parallel motion arm structure'pivotallyimount- `ed on saidbaseiorhorizontal swinging fmove- :ment relative thereto, atcutteiV headrotatably mounted on the forward extremity oi 'said arm base,. and meansfor: adjusting.y said' head/axis` out fof :parallelism lwith said.longitudinally extendiingline.` l l f' i V72. :In .laniiningapparatusya portable base, an varm structurepivotally mounted on said base toSwing :horizontallyrelative thereto about a Yverticalaxis, ai framesupported on the outer extreinityxof said armstructurefandto which. saidarm:structureV is vpivotally connected, said frame beingswingable abouta parallelk axisrelativet'o said arm structureJandsaid 'arm structureproviding a`zparallel motion device connectingsaid irameitossaid base, acutter head mounted on said frameiorrotationrelative thereto about aM*l3.`ln a miningapparatuaa portable base, an

arm structure pivotally mounted on Ysaid basetto swing horizontallyrelative. thereto about :a verticalfaxisa rarnesupported on the outerextremity of `said varm `structure and to which said arm structureispivotally connected, saidirame Vbeingswingable about` a parallel axisrelative .to said armstructure'and said arm structure pro- `viding'aparallel motionzdevice connecting said frame to said base, .a cutterhead mounted on said frame for rotation :relative thereto about ahorizontalaxis, aikerf cutter pivotallyinountedon said cutter head,devices for rotating said cutterhead about its axis; and for swingingsaid kerf cutter about its pivot, and motor operated devices-forswinging Vsaid arm structurezhorizon tally `relative'ito said base.

lapin a mining apparatus, a portable base, an arm structure pivotallymounted onsaid base toswing horizontally relative thereto alooutaverticalaxis, aframe supported on the outer extremity of said armstructure and` to which said arm structure ispivotally connected, saidframe lbeingzswingable about afparallelaxis relative to said larmstructure, a cutter' head mounted on said frame 'for rotation nrelativethereto about afhorizontalaxia a kerfcutterpivotally mount- .ed on `saidcutter head,` devicesfor rotating said `cutterhead about its axis andiorswinging said .kerl cutter-about` its pivot, and motor operatedrdevicesiorvswinging said armstructure horizontally relative to saidbase-and including a motor supported `on saidbase andrelative to whichsaid arm structure is swingable.

75.1na mining apparatus, a portable base, an Yarm structure pivotallymounted on said base for horizontal swinging movement relative thereto`about a 4vertical axis, a frame supported on the outer Yextremity of,said arm structure and to which `the llatter is `pivotally connected,said framebeing' swingable about a parallel axis relative to said arm`structure and said arm structure providing a parallel motion deviceconnecting said franiefto saidbase, a cutter `head supported bysaidframe-for rotation relative thereto about a horizontal axis, a kerfcutter mounted on said 'cutter head and adjustable with said` head intohorizontal and vertical cuttingpositions, devices ,iorfrotating saidhead about its axis, and motor operated` devices `for driving said kerfcutter.

` 'nl'n ainining apparatus,V a portable base, an arm structure includingan yarm element `pivotailymountedon the forward `end ofsaid base to"swing ina horizontaldirection relative thereto` about a vertical axis,lierf Y cutting mechanism includinga'kerf cutter 4having orbitallymovable Icuttingelementsand mounted on the outer extremity off saidY:arm i structure and adjustable relativek thereto intohorizontalV andvertical cutting positions, said korf cutting mechanism'zand armstructure being adjustable relative to said base to position said kerfcutter to cut parallel vertical kerfs parallel to the longitudinalmedian line of said base, a motor carried by said base and relative towhich said arm structure is swingable, and devices driven by said motorfor actuating said kerf cutter to effect movement of its cuttingelements in their orbits.

77. In a mining apparatus, a portable base, an arm structure includingan arm element pivotally mounted on the forward end of said base toswing in a horizontal direction relative thereto about a vertical axis,kerf cutting mechanism including a kerf cutter' mounted on the outerextremity of said arm structure and adjustable relative thereto intohorizontal and vertical cutting positions, said kerf cutting mechanismand arm structure being adjustable relative to said base to positionsaid kerf cutter to cut parallel vertical keris parallel to thelongitudinal median line of said base, a motor carried by said base andrelative to which said arm structure is swingable, devices driven bysaid motor for actuating said kerf cutter, and devices driven by saidmotor for swinging said arm structure relative to said base.

'78. In a mining apparatus, a portable base, a parallel motion deviceincluding an arm pivotally mounted on said base and a second armpivotally mounted on said rst arm to swing relative thereto about anaxis parallel with the pivotal axis of the first arm, said second armoverhanging said base, a cutter head rotatably mounted on the outeroverhanging extremity of said second arm, and a kerf cutter pivotallymounted on said cutter head and adjustable with said head about the headaxis into different cutting positions, said arms being adjustable tomove said kerf cutter into different cutting positions, and means foradjusting said arms relative to said base.

79. In a mining apparatus, a portable base, a parallel motion deviceincluding an arm pivotally mounted on said base and a second armpivotally mounted on said first arm to swing relative thereto about anaxis parallel with the pivotal axis of the iirst arm, said second armoverhanging said base, a cutter head rotatably mounted on the outeroverhanging extremity of said second arm, and a kerf cutter pivotallymounted on said cutter head and adjustable with said head about the headaxis into different cutting positions, said arms being adjustable tomove said kerf cutter into different cutting positions, and means foradjusting said arms relative to said base, said second arm beingswingable relative to the rst arm while the latter remains stationary asregards swinging movement about its own axis.

80. In a mining apparatus, a portable base, an arm structure pivotallymounted on said base to swing horizontally relative thereto, kerfcutting mechanism mounted on the outer extremity of said arm structureand including a plane kerf cutter swingable vertically to cut a verticalkerf, said kerf cutting mechanism and said arm structure beingadjustable relative to said base to position the kerf cutter to cut aseries of parallel vertical plane kerfs parallel to the longitudinalmedian line ci said base and between the sides and beyond the oppositesides of said base while said kerf cutter always remains in a verticalcutting position, and means for adjusting said kerf cutting mechanismrelative to said arm structure to position said kerf cutter to out ahorizontal kerf. Y

81. In a mining apparatus, a portable base, an arm structure pivotallymounted on said base to swing horizontally relative thereto, kerfcutting mechanism mounted on the outer extremity of said arm structureand including a plane kerf cutter having a cutter chain and swingablevertically to cut a vertical kerf, said kerf cutting mechanism and saidarm structure being adjustable relative to said base to position thekerf cutter to cut a series of parallel vertical plane kerfs parallel tothe longitudinal median line of said base and between the sides andbeyond the opposite sides of said base, means for adjusting said kerfcutting mechanism relative to said arm structure to position said kerfcutter to cut a horizontal kerf, and a motor on said base and relativeto which said arm structure is swingable for actuating the chain of saidkerf cutter.

82. In a mining apparatus, a portable base, an arm structure pivotallymounted on said base to swing horizontally relative thereto, kerfcutting mechanism mounted on the outer extremity of said arm structureand including a plane kerf cutter swingable vertically to cut a verticalkerf, said kerf cutting mechanism and said arm structure beingadjustable relative to said base to position the kerf cutter to cut aseries of parallel vertical plane kerfs parallel to the longitudinalme-dian line of said base and between the sides and beyond the oppositesides of said base, means for adjusting said kerf cutting mechanismrelative to said arm structure to position said kerf cutter to cut ahorizontal kerf, and a motor on said base and relative to which said armstructure is swingable for actuating said kerf cutter and for swingingsaid arm structure relative to said base.

83. In a mining apparatus, a portable base, an arm structure pivotallymounted on said base to swing horizontally relative thereto, a cutterhead rotatably mounted on the outer extremity of said arm structure torotate relative thereto about a horizontal axis, a kerf cutter pivotallymounted on said cutter head to swing relative thereto and adjustablewith said head about the head axis into horizontal and vertical cuttingpositions, said head being adjustable relative to said arm structure andsaid arm structure being swingable relative to said base to positionsaid kerf cutter to cut a series of parallel vertical kerfs parallel tothe longitudinal median line of the base and from one side of theapparatus to the other and beyond the sides of said base, said kerfcutter being adjustable into aforesaid vertical cutting positions whilesaid head remains stationary as regards rotation about its own axis.

84. In a. mining apparatus, a portable base, an arm structure pivotallymounted on said base to swing horizontally relative thereto, a cutterhead rotatably mounted on the outer extremity of said arm structure torotate relative thereto about a horizontal axis, a kerf cutter havingorbitally movable cutting elements and pivotally mounted on said cutterhead to swing relative thereto and adjustable with said head about thehead axis into horizontal and vertical cutting positions, said headbeing adjustable relative to said arm structure and said arm structurebeing swingable relative to said base to position said kerf cutter tocut a series of parallel vertical kerfs parallel to the longitudinalmedian line of the base and from one side of the apparatus to the otherand while said head remains stationary as regards rotation about its ownaxis, and a motor on said base and relative to which said

